Surfacing tool



April 25, 192.3.

H. E. TAUTz SURFACING TOOL Filed Nv. 16, 1931 v Patented Apr. 25, 1933-Hamam' a. raurz, or mwauxnn, wrsconsm, wisconsin,

TUBING GOITLN'Y, 0l' MILWAUKEE,

.ABSIGNOB T DELTA. m50- .Av CORPOBATIQN OF fWISOONBm" SUBFACIN 'TOOL IApplication tiled November 16.

This invention relates to rotary surfacing tools and has particularapplication to the construction of abrading tools known as sandingdrums.

An object of the invention is the provision Ain a rotary surfacingtooltof a novel mount ing for the work engaging element thereof wherebya uniform bearing and resilient suport is provided or the entireeiective surace of the work engaging element.

Another object is the provision of a surlfacing tool having a supportfora work engaging element, which support ossesses inherent resiliencyand which is a apted to be forcedl into `holding engagement with thework en aging element.

'A urt er object is the provision of a sanding drum having an inherentlyresilient supporting b ase for receiving a sanding sleeve and which isprovided with means for internally expanding the bas into uniformholding and bearing enga ner face of the sandln sleeve. Other detailswill be ap arent rom the description.

Itis to be un erstood that the present disclosure shall not constitute alimitation inconsistent with the scope of the invention as claimed. Thepresent disclosure defines a hysical embodiment of the principles ofthis invention and constitutes a showing of a prefer-red means forreducing the invention to practice. While the disclosed formV has specicreference to a sanding drum it is obvious that the principles can haveapplication t any form of surfacing tool.

In the drawing.: y

Figure 1 is a perspective of a sanding drum constructed in accordancewith theinvention.

therethrough.

Figure 3 is a i 3i`3 of Fgure 2.

igure 1s a ou 'ers ective of internal elements off thegdrruriip p In thedisclosed embodiment the invention consists of a support in the form ofa. spindle 5 provided with a longitudinal keyway 6 and externallythreadedl at one end 7 At its op- .5 posite end the spindle is formedwith ananement against the in- Figure 2 is a vertical longitudinalsection transverse section on the line 1931. Serial No. 575,888..

larged head 8 providedv with a socket bore 9 whereby the spindle may beattached to a driving clement by means of suitable astening elements,here shown as hollow head set screws 10. y y

In making up the tool a metal end plate comprising a disk 11 is slidaxially over the s indle from its threaded end to rest against t e head8, the plate being provided w1th an annular central bore so that aspindle may be inserted therethrough. Following the application of theend plate 11 a substantially resilient core is applied over the spindlein` the same manner. As best shown in Figure 2, this core consists of aseries of parallel disks or washers 12 of resilient material 'such asrubber. These washers are provided with central annular bores withinwhich are received metal bushings 13 having a width less than thethickness of the washers. By virtue of the bushings 13 the washers 12are capable of rotary and axially slidable movemexiit of the spindle inthe assembly ofthe. too i The series of members 13 is spaced by means ofnonresilient spacer suitable material, preferably bakelite, which arecentrally apertured as at 15 to en ageover the spindle, and 4which havechor ial p0rtions 16 adapted to be engaged in the longitudinal keyway 6of the spindleso that wh1le these spacer disks may be slid axially uponthe spindle, rotary movement thereon isl prevented. These spacer disks14 are of appreciably smaller diameter than the annular resilientmembers 12. At the outer end of the spindle adjacent the threaded endportion 7 a second metal end plate 17 is disposed over the spindle andis held in place by a securing nut 18 threaded over the spindle end.

Prior to service the assembled spindle and core are arranged so that theresilient members 12 and spacer disks 14 have a relatively looseengagement with respect to their mounting upon the spindle. A workengaging band here shown as a sandin sleeve 19isA then applied over thecore by sliding the same axially thereover from one end. The peripheralfaces ofthe resilient washers 12 provide a supporting surface for thesanding sleeveA disks 14 of a and as under normal assembly conditionsthe maximum external diameter `of the members 12 is only slightly lessthan the internal diameter of the sanding sleeve, the sleeve may be 5.readily positioned over the core and will have relatively loose supportthereon.. A

With the .sleeve or work engaging band properly assembled with respectto its resilient supporting core the nut 18 is tightened to clampagainst the end plate 17 and force the same axially inward whereupon allof the resilient core members 12 will be compressed between the plates11 and 17. A continued compression by manipulation of the nut 18 willcause a radial expansion of the members 12 so that their peripheralsurfaces will expand uniformly throughout their entire area. Thisexpansion eectively binds the resilient members against the inner facet.. of the sanding sleeve so that the sleeve is firmly anchored withrespect to the core and cannot move with respect thereto. At the sametime this firm anchorage of the sanding sleeve is accomplished without aloss of re- 2,5. siliency in its support as the material of the members12 provides an e'ective resilient filler means existing between thesupportin spindle and the sanding sleeve.

t is obvious that the bushings 13 will in 3.0i themselves constitute ameans acting to limit the compreing movement of the plates l1 and 17 asthe spacer disks i4; will ultimately moved into direct engagement withthe bushing ends to prevent an undesirahly high 52 degree of compressionsuch as would so expand the core sections as to impart a bursting strainto the sanding sleeve.

I claim:

1. A rotary surfacing tool com rising a spindle, annular core sectionsof resilient me.. terial axially slidable thereon, non-resilient spacerdisks slidable on the spindle and between said eore sections/and meanson said spindle for forcing said core sections into radial expansion tohind and hold a. worlr engageable sleeve thereon when applied thereover.

2. A surfacin tool comprising a. spindle, a series of annu ar rubberwashers arranged thereon in parallel relation, non-resilient spacersbetween said washers, end plates on said spindle and bearing upon saidwashers, a work engageable sleeve slidably applicable over theperipheries of said washers, and means for moving an end late axiallyinward of the spindle where y to iiorce the f washers into radiallyexpanded holding engagement with said sleeve.

3. In a rotary surfacin tool, a spindle, a core thereon composed 0%' ofresilient material and uniform thickness each bein provided with acentral bore, nonresilient gearing sleeves'in the section bores 05 andof an axial extent less than the thick ness of the sections,ynon-resilient spacer annular sections members separatn said coresections, and means for compressing the core section axiall of thespindle to cause radial expansion thereof, the ends of said bearingsleeves and the spacer members being engageable under such compressionto limit the extent thereof.

4. A rotary surfacing tool comprising a spindle, a series of annularrubber core sections of equal diameter axially movable on said spindleand disposed in parallel relation, rigid spacer discs axially slidableon said spindle and disposed between said core sections, the diameter ofsaid spacer discs being less than the core sections2 end plates on saidspindle and bearing a einst the end core sections, a work engagea lesleeve applicable over the peripheries of the core sections, and meansfor movin an end plate axially inward on the spindle whereby to compressthe core sections between said end plates and spacer dises and expandthe core sections radially into holding engagement with said sleeve.

In testimony whereof I alx my si attire.

HERBERT E. TA. TZ.

